Table 2. Parkinson Disease (PD) and Other Neurodegenerative Parkinsonism Diagnoses.
| Variable | No. (%) | P value | ||
|---|---|---|---|---|
| Camp Lejeune (n = 279) | Camp Pendleton (n = 151) | Total (n = 430) | ||
| VHA records (% total PD) | 263 (94.3) | 135 (89.4) | 398 (92.6) | .07 |
| Medicare only (% total PD) | 16 (5.7) | 16 (10.6) | 32 (7.4) | |
| Crude PD prevalence, % | 0.33 | 0.21 | 0.27 | <.001 |
| Probable PD (% total PD) | 249 (89.2) | 127 (84.1) | 376 (87.4) | .12 |
| Possible PD (% total PD) | 30 (10.8) | 24 (15.9) | 54 (12.6) | |
| PD diagnosis age, mean (SD); range, y | 54.7 (7.2); 30.0-75.0 | 53.2 (7.7); 29.0-70.0 | 54.2 (7.4); 29.0-75.0 | .04 |
| Years from start of camp residence until PD diagnosis, mean (SD); range | 33.9 (7.1); 4.5-45.0 | 32.2 (7.3); 10.5-44.7 | 33.3 (7.2); 4.5-45.0 | .02 |
| PD before January 13, 2017 | 148 (53.0) | 109 (72.2) | 257 (59.7) | .19 |
| PD with VHA usage before PD incidence date | 173 (62.0) | 87 (57.6) | 260 (60.5) | <.001 |
| Other neurodegenerative parkinsonism | ||||
| DLB | 12 (0.014) | 7 (0.010) | 19 (0.012) | .41 |
| MSA | 4 (0.005) | 10 (0.014) | 14 (0.009) | .11 |
| PSP | 5 (0.006) | 5 (0.007) | 10 (0.006) | .82 |
| CBD | 1 (0.001) | 1 (0.001) | 2 (0.001) | .92 |
| Indeterminate | 7 (0.008) | 5 (0.007) | 12 (0.008) | .74 |
Abbreviations: CBD, corticobasal degeneration; DLB, dementia with Lewy bodies; MSA, multiple system atrophy; PSP, progressive supranuclear palsy; VHA, Veterans Health Administration.